Texas Penal Code Sec. 49.04. DRIVING WHILE INTOXICATED. (a) A person commits an offense if the person is intoxicated while operating a motor vehicle in a public place.

(b) Except as provided by Subsections (c) and (d) and Section 49.09, an offense under this section is a Class B misdemeanor, with a minimum term of confinement of 72 hours

(c) If it is shown on the trial of an offense under this section that at the time of the offense the person operating the motor vehicle had an open container of alcohol in the person's immediate possession, the offense is a Class B misdemeanor, with a minimum term of confinement of six days

(d) If it is shown on the trial of an offense under this section that an analysis of a specimen of the person's blood, breath, or urine showed an alcohol concentration level of 0.15 or more at the time the analysis was performed, the offense is a Class A misdemeanor.

Texas Penal Code Sec. 49.01. DEFINITIONS. In this chapter:

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(2) “Intoxicated” means

(A) not having the normal use of mental or physical faculties by reason of the introduction of alcohol, a controlled substance, a drug, a dangerous drug, a combination of two or more of those substances, or any other substance into the body; or

(B) having an alcohol concentration of 0.08 or more.

Texas Penal Code Sec. 49.045. DRIVING WHILE INTOXICATED WITH CHILD PASSENGER. (a) A person commits an offense if:

(1) the person is intoxicated while operating a motor vehicle in a public place; and

(2) the vehicle being operated by the person is occupied by a passenger who is younger than 15 years of age.

(b) An offense under this section is a state jail felony.

Texas Penal Code Sec. 49.09. ENHANCED OFFENSES AND PENALTIES. (a) Except as provided by Subsection (b), an offense under Section 49.04, 49.05, 49.06, or 49.065 is a Class A misdemeanor, with a minimum term of confinement of 30 days, if it is shown on the trial of the offense that the person has previously been convicted one time of an offense relating to the operating of a motor vehicle while intoxicated, …

(b) An offense under Section 49.04, 49.05, 49.06, or 49.065 is a felony of the third degree if it is shown on the trial of the offense that the person has previously been convicted:

(1) one time of an offense under Section 49.08 or an offense under the laws of another state if the offense contains elements that are substantially similar to the elements of an offense under Section 49.08; or

(2) two times of any other offense relating to the operating of a motor vehicle while intoxicated, …